First off, I love the show. It is great to see a firearm company (any type of company for that matter) that is doing well and mixes fun with family.
Second, I saw the episode with the ballistic knife and it got me thinking.
#1) It may have just been how the show was cut but it seemed as though the handle flying out of your hand was the big issue.
#2) What good is a knife handle once the blade has been fired?
Possible solution to both problems: Make it in the style of a trench knife....brass knuckle handle. It would likely give you more control over the recoil and once the blade is fired you're still left with something that would be useful in self-defense situation.
Best wishes for your success in the future. Looking forward to seeing more of your creations.